3722521 has 4 divisors (see below), whose sum is σ = 4060944. Its totient is φ = 3384100.

The previous prime is 3722519. The next prime is 3722549. The reversal of 3722521 is 1252273.

3722521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1252273 = 11 ⋅113843.

It is a cyclic number.

It is not a de Polignac number, because 3722521 - 2¹ = 3722519 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3722492 and 3722501.

It is not an unprimeable number, because it can be changed into a prime (3722591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169195 + ... + 169216.

It is an arithmetic number, because the mean of its divisors is an integer number (1015236).

Almost surely, 2^3722521 is an apocalyptic number.

It is an amenable number.

3722521 is a deficient number, since it is larger than the sum of its proper divisors (338423).

3722521 is a wasteful number, since it uses less digits than its factorization.

3722521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338422.

The product of its digits is 840, while the sum is 22.

The square root of 3722521 is about 1929.3835803178. The cubic root of 3722521 is about 154.9812117359.

Adding to 3722521 its reverse (1252273), we get a palindrome (4974794).

The spelling of 3722521 in words is "three million, seven hundred twenty-two thousand, five hundred twenty-one".